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415 Unsupported Media Type - HTTP | MDN
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/415
その場合はこっち
developer.mozilla.org415 Unsupported Media Type - HTTP | MDNThe HTTP 415 Unsupported Media Type client error response
code indicates that the server refuses to accept the request because the payload format
is in an unsupported format.